[ 17.248158][ T232] ==================================================================
[ 17.248519][ T232] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 17.248769][ T232] Read of size 1 at addr ffff888004fc068c by task packetdrill/232
[ 17.249080][ T232]
[ 17.249181][ T232] CPU: 3 UID: 0 PID: 232 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.249186][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.249189][ T232] Call Trace:
[ 17.249195][ T232]
[ 17.249197][ T232] dump_stack_lvl+0x82/0xc0
[ 17.249210][ T232] print_address_description.constprop.0+0x2c/0x3a0
[ 17.249224][ T232] ? kobject_put+0xbb/0xd0
[ 17.249230][ T232] print_report+0xb4/0x270
[ 17.249235][ T232] ? kobject_put+0xbb/0xd0
[ 17.249240][ T232] ? kasan_addr_to_slab+0x21/0x70
[ 17.249243][ T232] ? kobject_put+0xbb/0xd0
[ 17.249246][ T232] kasan_report+0xca/0x100
[ 17.249250][ T232] ? kobject_put+0xbb/0xd0
[ 17.249256][ T232] kobject_put+0xbb/0xd0
[ 17.249259][ T232] netdev_run_todo+0x5f0/0xc60
[ 17.249265][ T232] ? rtnl_is_locked+0x15/0x20
[ 17.249270][ T232] ? netif_state_change+0x228/0x2c0
[ 17.249274][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 17.249278][ T232] ? generic_xdp_install+0x410/0x410
[ 17.249285][ T232] ? tun_chr_close+0xae/0x1c0
[ 17.249294][ T232] tun_chr_close+0xc0/0x1c0
[ 17.249298][ T232] __fput+0x35c/0xa70
[ 17.249306][ T232] fput_close_sync+0xdd/0x1b0
[ 17.249309][ T232] ? alloc_file_clone+0xf0/0xf0
[ 17.249314][ T232] __x64_sys_close+0x7d/0xd0
[ 17.249318][ T232] do_syscall_64+0xc1/0xfd0
[ 17.249324][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.249329][ T232] RIP: 0033:0x4901eb
[ 17.249335][ T232] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[ 17.249338][ T232] RSP: 002b:00007fffc6ea4ea0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 17.249345][ T232] RAX: ffffffffffffffda RBX: 00007fffc6ea5400 RCX: 00000000004901eb
[ 17.249347][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 17.249349][ T232] RBP: 00007fffc6ea4ee0 R08: 0000000000000000 R09: 0000000000000000
[ 17.249351][ T232] R10: 0000000000000004 R11: 0000000000000293 R12: 00007fffc6ea5378
[ 17.249353][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 17.249359][ T232]
[ 17.249360][ T232]
[ 17.257286][ T232] The buggy address belongs to the physical page:
[ 17.257523][ T232] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888004fc1c00 pfn:0x4fc0
[ 17.257932][ T232] flags: 0x80000000000000(node=0|zone=1)
[ 17.258134][ T232] raw: 0080000000000000 ffffea00002f5208 ffff8880363bbc40 0000000000000000
[ 17.258516][ T232] raw: ffff888004fc1c00 0000000000000000 00000000ffffffff 0000000000000000
[ 17.258841][ T232] page dumped because: kasan: bad access detected
[ 17.259077][ T232]
[ 17.259195][ T232] Memory state around the buggy address:
[ 17.259383][ T232] ffff888004fc0580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.259689][ T232] ffff888004fc0600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.259964][ T232] >ffff888004fc0680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.260258][ T232] ^
[ 17.260386][ T232] ffff888004fc0700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.260661][ T232] ffff888004fc0780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.260929][ T232] ==================================================================
[ 17.261461][ T232] Disabling lock debugging due to kernel taint
[ 17.261701][ T232] ------------[ cut here ]------------
[ 17.261870][ T232] refcount_t: underflow; use-after-free.
[ 17.262088][ T232] WARNING: CPU: 3 PID: 232 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 17.262480][ T232] Modules linked in:
[ 17.262632][ T232] CPU: 3 UID: 0 PID: 232 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.263079][ T232] Tainted: [B]=BAD_PAGE
[ 17.263215][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.263462][ T232] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 17.263712][ T232] Code: 3f 92 02 80 fb 01 0f 87 bb b9 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 5e 3f 92 02 01 90 48 c7 c7 20 8d 05 af e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 17.264511][ T232] RSP: 0018:ffffc90000ae7ce8 EFLAGS: 00010282
[ 17.264774][ T232] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 17.265071][ T232] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 17.265456][ T232] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5f3e134
[ 17.265732][ T232] R10: 0000000000000003 R11: ffffc90000ae7880 R12: 0000000000000001
[ 17.266015][ T232] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 17.266419][ T232] FS: 000000003ee3d3c0(0000) GS:ffff88808559a000(0000) knlGS:0000000000000000
[ 17.266764][ T232] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 17.267014][ T232] CR2: 00007f7666aa4000 CR3: 000000000a888006 CR4: 0000000000772ef0
[ 17.267408][ T232] PKRU: 55555554
[ 17.267554][ T232] Call Trace:
[ 17.267705][ T232]
[ 17.267802][ T232] netdev_run_todo+0x5f0/0xc60
[ 17.268114][ T232] ? rtnl_is_locked+0x15/0x20
[ 17.268306][ T232] ? netif_state_change+0x228/0x2c0
[ 17.268505][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 17.268749][ T232] ? generic_xdp_install+0x410/0x410
[ 17.269047][ T232] ? tun_chr_close+0xae/0x1c0
[ 17.269254][ T232] tun_chr_close+0xc0/0x1c0
[ 17.269431][ T232] __fput+0x35c/0xa70
[ 17.269592][ T232] fput_close_sync+0xdd/0x1b0
[ 17.269875][ T232] ? alloc_file_clone+0xf0/0xf0
[ 17.270074][ T232] __x64_sys_close+0x7d/0xd0
[ 17.270268][ T232] do_syscall_64+0xc1/0xfd0
[ 17.270446][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.270760][ T232] RIP: 0033:0x4901eb
[ 17.270925][ T232] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[ 17.271736][ T232] RSP: 002b:00007fffc6ea4ea0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 17.272064][ T232] RAX: ffffffffffffffda RBX: 00007fffc6ea5400 RCX: 00000000004901eb
[ 17.272354][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 17.272738][ T232] RBP: 00007fffc6ea4ee0 R08: 0000000000000000 R09: 0000000000000000
[ 17.273017][ T232] R10: 0000000000000004 R11: 0000000000000293 R12: 00007fffc6ea5378
[ 17.273408][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 17.273683][ T232]
[ 17.273830][ T232] irq event stamp: 1940697
[ 17.274033][ T232] hardirqs last enabled at (1940697): [] irqentry_exit+0x3b/0x80
[ 17.274466][ T232] hardirqs last disabled at (1940696): [] handle_softirqs+0x47f/0x610
[ 17.274786][ T232] softirqs last enabled at (1940272): [] handle_softirqs+0x352/0x610
[ 17.275215][ T232] softirqs last disabled at (1940265): [] irq_exit_rcu+0xab/0x100
[ 17.275542][ T232] ---[ end trace 0000000000000000 ]---